Naruto already resolved to kill Sasuke (at the expense of losing his own life) when they met after Sasuke killed Danzo. He knew the best he could do was tie with him, hence the "we'll both die" statement. Also there's a scan in the vote2 fight which shows Sasuke saying "you're finally trying to kill me" which pretty much disproves Naruto's lack of killing intent. You don't harness all of the world's energy into a bijuu bomb and hurl it at someone you're not trying to kill.
Sasuke siphoned a portion of the bijuu's chakra with his own powers for one attack, that's a little different to them being gifted to you by friendship and having a conscious being inside of you, guiding you tactically, gathering chakra for you, etc.
The Naruto was tired excuse is lame, Sasuke fought a bunch too.
I could argue for days but I don't need to. The reality is that Naruto vs Sasuke's record is one tie and:
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I see the whole "Ashura's incarnate is inferior and needs cooperation to match Indra's incarnate's individual talent" thing went over your head